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AD537* PDF预览

AD537*

更新时间: 2024-11-08 23:27:15
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描述
Integrated Circuit Voltage-to-Frequency Converter

AD537* 数据手册

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Integrated Circuit  
Voltage-to-Frequency Converter  
a
AD537*  
FEATURES  
PIN CONFIGURATIONS  
Low Cost A–D Conversion  
Versatile Input Amplifier  
D-14 Package  
H-10A Package  
Positive or Negative Voltage Modes  
Negative Current Mode  
High Input Impedance, Low Drift  
Single Supply, 5 V to 36 V  
Linearity: ؎0.05% FS  
Low Power: 1.2 mA Quiescent Current  
Full-Scale Frequency up to 100 kHz  
1.00 V Reference  
Thermometer Output (1 mV/K)  
F-V Applications  
LOGIC GND  
10  
–V  
IN  
OUTPUT  
AD537  
9
1 AD537  
LOGIC GND  
SYNC  
1
2
14  
13  
OUTPUT  
DRIVER  
+V  
S
DRIVER  
+V  
IN  
+V  
2
8
7
S
I
3
4
12  
11  
CURR-  
TO-FREQ  
CONV  
IN  
CAP  
CAP  
CURR-  
BUF  
–V  
IN  
TO-FREQ  
BUF  
CONV  
+V  
IN  
3
V
5
6
10  
9
OS  
V
V
PRECISION  
VOLTAGE  
T
V
CAP  
TEMP  
V
V
TEMP  
OS  
V
V
PRECISION  
VOLTAGE  
REFERENCE  
R
REFERENCE  
T
4
6
V
7
8
–V  
S
REF  
R
V
REF  
CAP  
5
MIL-STD-883 Compliant Versions Available  
–V  
S
(CONNECTED TO CASE)  
PRODUCT DESCRIPTION  
The AD537 is available in three performance/temperature  
The AD537 is a monolithic V-F converter consisting of an input  
amplifier, a precision oscillator system, an accurate internal ref-  
erence generator and a high current output stage. Only a single  
external RC network is required to set up any full-scale (F.S.)  
frequency up to 100 kHz and any F.S. input voltage up to  
30 V. Linearity error is as low as 0.05% for 10 kHz F.S., and  
operation is guaranteed over an 80 dB dynamic range. The over-  
all temperature coefficient (excluding the effects of external  
components) is typically 30 ppm/°C. The AD537 operates  
from a single supply of 5 V to 36 V and consumes only 1.2 mA  
quiescent current.  
grades; the J and K grades are specified for operation over the  
0°C to +70°C range while the AD537S is specified for operation  
over the extended temperature range, –55°C to +125°C.  
PRODUCT HIGHLIGHTS  
1. The AD537 is a complete V-F converter requiring only an  
external RC timing network to set the desired full-scale fre-  
quency and a selectable pull-up resistor for the open collec-  
tor output stage. Any full-scale input voltage range from  
100 mV to 10 volts (or greater, depending on +VS) can be  
accommodated by proper selection of timing resistor. The  
full-scale frequency is then set by the timing capacitor from  
the simple relationship, f = V/10RC.  
A temperature-proportional output, scaled to 1.00 mV/K,  
enables the circuit to be used as a reliable temperature-to-  
frequency converter; in combination with the fixed reference  
output of 1.00 V, offset scales such as 0°C or 0°F can be generated.  
2. The power supply requirements are minimal, only 1.2 mA  
quiescent current is drawn from a single positive supply from  
4.5 volts to 36 volts. In this mode, positive inputs can vary  
from 0 volts (ground) to (+VS – 4) volts. Negative inputs can  
easily be connected for below ground operation.  
The low drift (1 µV/°C typ) input amplifier allows operation  
directly from small signals (e.g., thermocouples or strain gages)  
while offering a high (250 M) input resistance. Unlike most  
V–F converters, the AD537 provides a square-wave output, and  
can drive up to 12 TTL loads, LEDs, very long cables, etc.  
3. F-V converters with excellent characteristic are also easy to  
build by connecting the AD537 in a phase-locked loop. Ap-  
plication particulars are shown in Figure 6.  
The excellent temperature characteristics and long-term stability  
of the AD537 are guaranteed by the primary bandgap reference  
generator and the low T.C. silicon chromium thin film resistors  
used throughout.  
4. The versatile open-collector NPN output stage can sink up  
to 20 mA with a saturation voltage less than 0.4 volts. The  
Logic Common terminal can be connected to any level be-  
tween ground (or –VS) and 4 volts below +VS. This allows  
easy direct interface to any logic family with either positive or  
negative logic levels.  
The device is available in either a 14-lead ceramic DIP or a 10-lead  
metal can; both are hermetically sealed packages.  
5. The AD537 is available in versions compliant with MIL-  
STD-883. Refer to the Analog Devices Military Product  
Databook or current AD537/883B data sheet for detailed  
specifications.  
*Protected by Patent Nos. 3,887,963 and RE 30,586.  
REV. C  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 2000  

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